Overhead distributing line ground fault indicating device based on zero-sequence component method

Abstract

The invention provides an overhead distributing line ground fault indicating device based on a zero-sequence component method. The overhead distributing line ground fault indicating device comprises an electric pole type fault indicator which is mounted on an electric pole used for erecting a distributing line. The electric pole fault indicator detects local zero-sequence currents and zero-sequence voltages, and after the value of the local zero-sequence currents / zero-sequence voltages reach a prestored zero-sequence current threshold value / zero-sequence voltage threshold value, one-phase grounding alarm is conducted. The overhead distributing line ground fault indicating device does not need to be mounted on the distributing line, and can conduct real-time monitoring on the one-phase grounding condition of the distributing line, the position of one-phase grounding faults can be positioned quickly and precisely when line faults happen, and therefore powerful support for quickly removing the faults and restoring power is provided.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a ground fault indication device for overhead power distribution lines based on the zero-sequence component method. Background technique [0002] Overhead power distribution lines are widely distributed in urban and rural areas. Most of the network construction period is early, the equipment is seriously aging, and it is susceptible to interference from the natural environment and human factors. Therefore, single-phase ground faults are prone to occur on the lines during operation. Affect the normal power supply of the line. Therefore, there is a need for a solution capable of detecting a single-phase-to-ground fault in a line. [0003] Single-phase ground fault detection in the prior art mainly has the following two methods: [0004] 1. A single-phase ground fault detection scheme based on the instantaneous signal method. This scheme is mainly to monitor a high-frequen...

AI Technical Summary

Problems solved by technology

[0008] The invention provides a ground fault indicator device for overhead distribution lines based on the zero-sequence component method, which is used to solve the problem that the single-phase ground fault detection indicator needs to be installed on the line in the prior art and the fault detection is not fast enough, and the fault point location is not accurate enough question

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